T'is true, an in-game team doesn't matter nearly as much as a competitive team. But hey, what's the fun in just overleveling a single poke and crushing everything? Nothing wrong with a bit of strategizing.

Any decently smart player (You don't even have to play competitively) would know better than using an all attacking Shuckle. But, just because I feel like being a smart-@$%

Shuckle - Leftovers
Bide
Bug Bite / Rock Smash
Secret Power
Wrap

Massive defenses will lead to solid hits with Bide. Bug Bite to steal the occasional berry holding Pokemon, otherwise Rock Smash would be preferred for the defense drop for Secret Power/Wrap. Secret Power for the possible status affliction, and Wrap to consistently damage.